Resolution 3528 - Laserfiche WebLink

as measured from the top of each side of the stream bank. Per Subsection 37.150.B.6, if the stream is near a slope equal to or greater than twenty-five percent (25%), the buffer shall be the greater of twenty-five (25) feet from the top of the stream bank or twenty-five (25) feet beyond the top of the slope, as defined in Subsection 4.010.A.169.B of the Zoning Code. Prior to issuance of construction permits for the proposed drainage detention facilities and surface parking areas adjacent to intermittent tributaries A and B, a wetland biologist must flag the required buffers defined in Conditions i. and ii. above, and the City must approve the buffer delineations in the field (Decision Document pp. 20-21). • Additionally, the Decision Document requires protective covenants to be recorded "for all environmentally sensitive areas which are required to be protected under this mitigation Decision", involving "streams and wetlands and their associated buffers" (see Decision Document, General Mitigation, Environmentally Sensitive Areas, b. -pg 13). • The Decision Document requires that "vegetated swales shall be provided to treat stormwater runoff for all development except that area currently draining to the peat filter system" (Decision Document pg 14). Vegetated swales are not permitted within wetlands or wetland buffer areas except as necessary to convey previously treated stormwater across the buffer. The Decision Document requires all such necessary buffer crossings "be designed to limit intrusion into the buffer to the maximum practical extent" (Decision Document, pg 23). • The sand peat filter system is solely for treatment of surface water, and is not part of the approved wetlands mitigation area. The purpose of the sand peat filter is to remove surface water pollutants prior to discharge into the wetlands. The level of water quality treatment provided by the sand peat filter is substantially superior to treatment that would be provided by vegetated swales (also, see Findings and Conclusions under Section 8 of Resolution - Sand Peat Filter System). • The Decision Document permits the filling of .70 acres of wetlands, and requires "a minimum replacement ratio of 3:1, consistent with City of Everett and DOE Policy". A wetland mitigation plan including monitoring and contingency provisions must be reviewed and approved by the City (see Decision Document, General Mitigation, 2.a. Wetland Mitigation,pg 12). Required biofilters and other water quality treatment systems including the sand peat filter system, are identified in the Decision Document as specific additional requirements and may not be considered part of the wetland mitigation area. Conclusions: • SEPA policies have been applied to the Boeing Master Development Plan in a manner that is consistent with SEPA requirements and with the application of these policies to 15